Move internal trackers files in common
Fix regex in artefact details
various cleanup & more tooltips
mostly merge r13290 from 5.1 (I erred on the side of caution, so the XHTML in trunk will still be invalid in some cases)
Make displayed order of followups configurable in trackers and tasks
Handle <h1> and sub menu directly in header() to allow cleaner code and allow theme to embed submenu inside the menu if needed.
Merged from 5.1: template projects, iframes in the extratabs, and lots of fixes
Add user_logo hook in various place of the forge.
html_image() cleanup
exit functions migration
Rename gforge dir as src